The ordinal form of the number eighty-six, describing a person or thing in position number 86 of a sequence.(noun)
One of eighty-six equal parts of a whole.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "eighty-sixth" in a sentence
"“And the world record for running up the 1,575 steps from the lobby to the eighty-sixth floor is nine minutes and thirty-three seconds!”"
"For the eighty-sixth consecutive autumn, the Boston Red Sox were not going to win the World Series."
"This is a deadpan, hilarious satire, documenting a single night at a small-town party organized by the local fire brigade, honoring their retiring chairman on his eighty-sixth birthday they missed honoring him on the more meaningful eighty-fifth, a year earlier, in the first of many fumbles committed by this incompetent assemblage."